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[net-next,3/3] net: mdio: aspeed: Add dummy read for fire control

Message ID 20241118104735.3741749-4-jacky_chou@aspeedtech.com (mailing list archive)
State New
Headers show
Series Add Aspeed G7 MDIO support | expand

Commit Message

Jacky Chou Nov. 18, 2024, 10:47 a.m. UTC 
Add a dummy read to ensure triggering mdio controller before starting
polling the status of mdio controller.

Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
---
 drivers/net/mdio/mdio-aspeed.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/net/mdio/mdio-aspeed.c b/drivers/net/mdio/mdio-aspeed.c
index 4d5a115baf85..feae30bc3e78 100644
--- a/drivers/net/mdio/mdio-aspeed.c
+++ b/drivers/net/mdio/mdio-aspeed.c
@@ -62,6 +62,8 @@  static int aspeed_mdio_op(struct mii_bus *bus, u8 st, u8 op, u8 phyad, u8 regad,
 		| FIELD_PREP(ASPEED_MDIO_DATA_MIIRDATA, data);
 
 	iowrite32(ctrl, ctx->base + ASPEED_MDIO_CTRL);
+	/* Add dummy read to ensure triggering mdio controller */
+	(void)ioread32(ctx->base + ASPEED_MDIO_CTRL);
 
 	return readl_poll_timeout(ctx->base + ASPEED_MDIO_CTRL, ctrl,
 				!(ctrl & ASPEED_MDIO_CTRL_FIRE),